Completely new to pumping

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Question... my air pump gauge measures kPa and not hg.. instructions say beginners use 3-4 hg? Am I correct in conversation to 10-12 kPa? I pump up to 9 kPa and the pressure is a little painful... am I starting off correctly? Older guy with slight PD and trying to get straightened out and bigger... any Vet help I could get would be much appreciated... also how many times a day should I pump? I wanna pump all day to get bigger...but know that’s wrong... thanks in advance for your help...